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We show that many graphs with bounded treewidth can be described as subgraphs of the strong product of a graph with smaller treewidth and a bounded-size complete graph. To this end, define the underlying treewidth of a graph class $\mathcal{G}$ to be the minimum non-negative integer $c$ such that, for some function $f$, for every graph $G \in \mathcal{G}$ there is a graph $H$ with $\textrm{tw}(H) \leqslant c$ such that $G$ is isomorphic to a subgraph of $H \boxtimes K_{f(\textrm{tw}(G))}$. We introduce disjointed coverings of graphs and show they determine the underlying treewidth of any graph class. Using this result, we prove that the class of planar graphs has underlying treewidth $3$; the class of $K_{s,t}$-minor-free graphs has underlying treewidth $s$ (for $t \geqslant \max \{s,3\}$); and the class of $K_t$-minor-free graphs has underlying treewidth $t-2$. In general, we prove that a monotone class has bounded underlying treewidth if and only if it excludes some fixed topological minor. We also study the underlying treewidth of graph classes defined by an excluded subgraph or excluded induced subgraph. We show that the class of graphs with no $H$ subgraph has bounded underlying treewidth if and only if every component of $H$ is a subdivided star, and that the class of graphs with no induced $H$ subgraph has bounded underlying treewidth if and only if every component of $H$ is a star.
This study explored programme recipients’ and deliverers’ experiences and perceived outcomes of accessing or facilitating a grocery gift card (GGC) programme from I Can for Kids (iCAN), a community-based programme that provides GGC to low-income families with children.
Design:
This qualitative descriptive study used Freedman et al’s framework of nutritious food access to guide data generation and analysis. Semi-structured interviews were conducted between August and November 2020. Data were analysed using directed content analysis with a deductive–inductive approach.
Participants:
Fifty-four participants were purposively recruited, including thirty-seven programme recipients who accessed iCAN’s GGC programme and seventeen programme deliverers who facilitated it.
Setting:
Calgary, Alberta, Canada.
Results:
Three themes were generated from the data. First, iCAN’s GGC programme promoted a sense of autonomy and dignity among programme recipients as they appreciated receiving financial support, the flexibility and convenience of using GGC, and the freedom to select foods they desired. Recipients perceived these benefits improved their social and emotional well-being. Second, recipients reported that the use of GGC improved their households’ dietary patterns and food skills. Third, both participant groups identified programmatic strengths and limitations.
Conclusion:
Programme recipients reported that iCAN’s GGC programme provided them with dignified access to nutritious food and improved their households’ finances, dietary patterns, and social and emotional well-being. Increasing the number of GGC provided to households on each occasion, establishing clear and consistent criteria for distributing GGC to recipients, and increasing potential donors’ awareness of iCAN’s GGC programme may augment the amount of support iCAN could provide to households.
This chapter provides a detailed consideration of neuroscience and neuroimaging evidence (collectively termed “neuroimaging evidence”) in US federal and state courts. While essentially an explanation of the law and science, the chapter also details ongoing concerns about neuroimaging evidence: issues related to the quality of the underlying science; the potential for an inferential leap from data to courtroom evidence; the lack of recognized clinical use of some neuroimaging technologies; and the problems of appropriate expertise.
The chapter includes several sections. First, it explains the types of neuroimaging that have been used (or excluded) in court, highlighting the foundational concerns about the studies in general and as applied. Second, it addresses the relevant rules of evidence and critical cases that shape courts’ approach to neuroscience evidence. Substantively, the chapter reviews a variety of criminal and, to a lesser extent, civil matters related to neuroimaging evidence. With respect to criminal law, the chapter explores questions of legal competency, insanity and legal responsibility, sentencing, psychopathy, claims of ineffective assistance of counsel, and neuroscience lie detection. In addition, the chapter examines the special role that neuroscience has played in the development of juvenile sentencing law. The civil section addresses neuroimaging in relationship to traumatic brain injury. Finally, the chapter considers some of the overarching concerns and potential promises about neuroimaging evidence, urging that more co-creation of standards between scientists and the legal profession take place in order to improve the quality of the neuroimaging evidence in court.
Play is an important developmental tool, rather than just an informal aspect of childhood. While children's actions are purposeful activities that help them make sense of their world (Ebbeck & Waniganayake, 2010), they are often misconstrued as messing about without purpose. This chapter addresses the theoretical aspects of play and describes how play supports child development. It discusses play in both the pre-school and school setting and play pedagogies to support science education.
OBJECTIVES
At the end of this chapter you will be able to:
■ describe the importance of play in young children's understanding of science concepts
■ describe different play pedagogies that support the development of scientific understanding in young children
■ outline the role of the teacher in supporting play pedagogies in science education.
The importance of play
The importance of play is assured through the work of many theorists. Froebel (1826) felt that ‘play is the purest, most spiritual activity of man’ (p. 3). He put his ideas about play into practice by creating the first schools for pre-school children, which he called ‘kindergarten’ (children's garden). These kindergartens stressed the natural growth of children through action or play, with the emphasis on pedagogies that encouraged and guided. Froebel also developed a range of practical resources to support children's play, which he called ‘gifts’, and educational activities, which he called ‘occupations’. Many of the practical educational resources used today originated or were developed from Froebel's ideas.
Rousseau (1911), in his work Emile, believed that children should be allowed to develop through play free from the restrictions imposed by society, and that early pedagogies should provide a balance between individual freedom and happiness and control from society. Most importantly, Rousseau stressed the importance of personalised learning, emphasising that adults and the context should accommodate the individual child rather than the child be expected to change to suit the adult or context. Child-centred learning and experiential learning, central to both play and scientific development, are legacies of Rousseau's theories.
Piaget looked at the development of play in children and identified four different types (Dockett & Fleer, 2002; Piaget, 1976): functional play involving the repeated use of objects or actions, constructive play involving the manipulation of objects to build or construct something, pretend or symbolic play where imaginary situations replace real ones, and rule-governed play that is used in games.
This collection of essays pays tribute to Nancy Freeman Regalado, a ground-breaking scholar in the field of medieval French literature whose research has always pushed beyond disciplinary boundaries. The articles in the volume reflect the depth and diversity of her scholarship, as well as her collaborations with literary critics, philologists, historians, art historians, musicologists, and vocalists - in France, England, and the United States. Inspired by her most recent work, these twenty-four essays are tied together by a single question, rich in ramifications: how does performance shape our understanding of medieval and pre-modern literature and culture, whether the nature of that performance is visual, linguistic, theatrical, musical, religious, didactic, socio-political, or editorial? The studies presented here invite us to look afresh at the interrelationship of audience, author, text, and artifact, to imagine new ways of conceptualizing the creation, transmission, and reception of medieval literature, music, and art.
EGLAL DOSS-QUINBY is Professor of French at Smith College; ROBERTA L. KRUEGER is Professor of French at Hamilton College; E. JANE BURNS is Professor of Women's Studies and Adjunct Professor of Comparative Literature at the University of North Carolina, Chapel Hill.
Contributors: ANNE AZÉMA, RENATE BLUMENFELD-KOSINSKI, CYNTHIA J. BROWN, ELIZABETH A. R. BROWN, MATILDA TOMARYN BRUCKNER, E. JANE BURNS, ARDIS BUTTERFIELD, KIMBERLEE CAMPBELL, ROBERT L. A. CLARK, MARK CRUSE, KATHRYN A. DUYS, ELIZABETH EMERY, SYLVIA HUOT, MARILYN LAWRENCE, KATHLEEN A. LOYSEN, LAURIE POSTLEWATE, EDWARD H. ROESNER, SAMUEL N. ROSENBERG, LUCY FREEMAN SANDLER, PAMELA SHEINGORN, HELEN SOLTERER, JANE H. M. TAYLOR, EVELYN BIRGE VITZ, LORI J. WALTERS, AND MICHEL ZINK.
Excavations at Tell Khaiber in southern Iraq by the Ur Region Archaeological Project have revealed a substantial building (hereafter the Public Building) dating to the mid-second millennium b.c. The results are significant for the light they shed on Babylonian provincial administration, particularly of food production, for revealing a previously unknown type of fortified monumental building, and for producing a dated archive, in context, of the little-understood Sealand Dynasty. The project also represents a return of British field archaeology to long-neglected Babylonia, in collaboration with Iraq's State Board for Antiquities and Heritage. Comments on the historical background and physical location of Tell Khaiber are followed by discussion of the form and function of the Public Building. Preliminary analysis of the associated archive provides insights into the social milieu of the time. Aspects of the material culture, including pottery, are also discussed.
To examine the relationship between homestead food production and night blindness among pre-school children in rural Bangladesh in the presence of a national vitamin A supplementation programme.
Design
A cross-sectional study.
Setting
A population-based sample of six rural divisions of Bangladesh assessed in the Bangladesh Nutrition Surveillance Project 2001–2005.
Subjects
A total of 158 898 children aged 12–59 months.
Results
The prevalence rates of night blindness in children among those who did and did not receive vitamin A capsules in the last 6 months were 0·07 % and 0·13 %, respectively. Given the known effect of vitamin A supplementation on night blindness, the analysis was stratified by children's receipt of vitamin A capsules in the last 6 months. Among children who did not receive vitamin A capsules in the last 6 months, the lack of a home garden was associated with increased odds of night blindness (OR = 3·16, 95 % CI 1·76, 5·68; P = 0·0001). Among children who received vitamin A capsules in the last 6 months, the lack of a home garden was not associated with night blindness (OR = 1·28, 95 % CI 0·71, 2·31; P = 0·4).
Conclusions
Homestead food production confers a protective effect against night blindness among pre-school children who missed vitamin A supplementation in rural Bangladesh.
Biodegradable polymers with high mechanical strength, flexibility and optical transparency, optimal degradation properties and biocompatibility are critical to the success of tissue engineered devices and drug delivery systems. In this work, microfluidic devices have been fabricated from elastomeric scaffolds with tunable degradation properties for applications in tissue engineering and regenerative medicine. Most biodegradable polymers suffer from short half life resulting from rapid and poorly controlled degradation upon implantation, exceedingly high stiffness, and limited compatibility with chemical functionalization. Here we report the first microfluidic devices constructed from a recently developed class of biodegradable elastomeric poly(ester amide)s, poly(1,3-diamino-2-hydroxypropane-co-polyol sebacate)s (APS), showing a much longer and highly tunable in vivo degradation half-life comparing to many other commonly used biodegradable polymers. The device is molded in a similar approach to that reported previously for conventional biodegradable polymers, and the bonded microfluidic channels are shown to be capable of supporting physiologic levels of flow and pressure. The device has been tested for degradation rate and gas permeation properties in order to predict performance in the implantation environment. This device is high resolution and fully biodegradable; the fabrication process is fast, inexpensive, reproducible, and scalable, making it the approach ideal for both rapid prototyping and manufacturing of tissue engineering scaffolds and vasculature and tissue and organ replacements.
Recent reforms of prostitution policy in the UK have been abolitionist in tone, with concerns about community safety and violence against women encouraging zero-tolerance strategies. In relation to street sex work, such strategies include a range of interventions – from voluntary referrals to compulsory intervention orders and Anti-Social Behaviour Orders (ASBOs) designed to extricate women apparently ‘trapped’ in street prostitution. Despite being heralded as a new approach, we argue that recent constructions of street sex work as a form of anti-social behaviour must be viewed as merely the latest attempt to construct the street sex worker as a social ‘other’. In this chapter we utilise both critical and empirical forms of enquiry to uncover the relationship between dominant constructions of the ‘problem of prostitution’ and the associated norms that operate across various historical epochs, focusing in particular on the recent association between street sex work and anti-social behaviour. By situating this within a critical historical analysis of prostitution policy, we are able to contextualise contemporary policy within the wider history of control and governance in order to show that the alleged antithesis of sex work to community safety owes as much to the ideological operation of law as to any inherent feature of commercial sex. In the main part of the chapter we consider the practical implications of recent reforms, which continue to follow this ideology. By reflecting on our recent Joseph Rowntree Foundation-funded study, which examined the experiences of those living and working in areas of street sex work, we outline some of the dangers of policy frameworks and techniques of control that continue to situate sex work as antithetical to the cultivation of community safety.
Recent reforms
Recent reviews and reforms of prostitution law in the UK (Home Office, 2004; 2006; Scottish Executive, 2004; 2006; 2007 Criminal Justice and Immigration Bill; 2007 Prostitution (Public Places) (Scotland) Act) have been widely acclaimed as marking an important sea-change in sex work policy, with new anxieties about community safety and exploitation joining more long-standing concerns about morality and decency. The Home Office strategy (2006) which informs current law reform proposals prioritises the promotion of community safety and the elimination of street sex work as a form of commercial exploitation in its key objectives.
This desktop review has been conducted, from the reviewers' perspective, to evaluate the merits, advantages and disadvantages of adopting the 6th edition of the American Medical Association (AMA6) Guides for the Evaluation of Permanent Impairment. The reviewers do not make any recommendation as to whether AMA6 should or should not be adopted by any particular jurisdiction, but rather provide comment from the perspective of a critical but constructive appraisal of published material. The observations reported represent the opinions of the reviewers, based on their appraisal of selected sections of AMA4, AMA5 and AMA6 and the associated literature. AMA6 has become surrounded by considerable controversy. At the time of review, at least two jurisdictions in the United States have voted against adoption of AMA6. While the paradigm shift away from the World Health Organization (WHO) International Classification of Impairment, Disability and Handicap (ICIDH) framework to the WHO International Classification of Functioning, Disability and Health (ICF) framework has attempted to ‘move with the times’, and AMA6 has attempted to reach higher levels of internal consistency and interrater and intrarater reliability, the methods used to achieve a radical change in the Guides has come under criticism. It is quite difficult to distinguish between speculative and substantive criticism, because of paucity or obscurity in both source documents and subsequent commentary. A range of concerns have been identified.
In 2007 the UK established a new single equalities body, to bring together the existing equality Commissions dealing with gender, disability, and race and ethnicity into a Commission for Equality and Human Rights. The promotion and enforcement of ‘equality and diversity’ is one of the three duties of the new body. This paper briefly explores diversity in relation to the theory of gender equality and also examines developments in policy at the EU level, which has provided much of the impetus for change. Our focus is on the policy approach and the tensions that the policy documents reveal about the emphasis on equality and diversity approach, in particular the extent to which attention to gender issues may get lost in the diversity bundle, and the extent to which a focus on the individual may be strengthened over the group.
Conceived as a series of policies intended to bring people back into cities, urban renaissance offers a new vision of environmentally sustainable, socially balanced, and aesthetically inspired urban regeneration. While clearly informed by New Labour's specific concerns about active citizenship, social inclusion, and community participation, urban renaissance has nonetheless been identified as following a well-tested and global model of urban regeneration reliant on the rolling out of the ‘gentrification frontier’ (Lees, 2003b; Atkinson, 2004; Atkinson & Bridge, 2005). In essence, the suggestion here is that the Urban Task Force and subsequent urban White Paper promote a model of regeneration that idealises middle-class lifestyles, and hence encourages the middle classes to move ‘back to the city’. In practical terms, however, the cash-starved state seems unprepared to intervene significantly in central city property markets, meaning this model of middle-class led regeneration is reliant on investment by private developers keen to exploit the gap between current and potential ground rent.
Local authorities lacking the financial means (or imagination) to revitalise areas of urban blight and disinvestment thus aim to serve up the central city as an unmissable investment opportunity for developers, believing an injection of capital is necessary to prevent a net outflow of consumers, businesses, and residents from city centres bedevilled by images of anti-social behaviour, drunken yobbery, second-class shopping, and unemployment (Baeten, 2002). Often, this requires local authorities to take steps to tame urban ‘disorder’, pioneering new techniques and technologies of ‘policing’ designed to promote consumer-led revitalisation. In some instances, this has involved the extension of private property rights to public space, with new agents of social control (for example, city centre guardians) seeking to maintain the civility of the streets through innovative forms of policing (Belina & Helms, 2003; Raco, 2003). Simultaneously, demands for reassurance policing has encouraged many communities to be more active in seeking partnership solutions to crime and disorder issues, with community watch and neighbourhood warden schemes now widespread (Crawford, 1998; Sagar, 2004).
Imposing a particular form of order on the streets is thus often depicted as the precursor of a benign form of civic renaissance. However, critical voices have stressed this is often about the imposition of middle-class consumerist values, and is actually about the displacement of those ‘Others’ who threaten consumer-led regeneration.
Three successive Labour governments have developed a range of work/family balance (WFB) policies, including child care services, leaves and flexible working hours, which have also become an increasingly coherent package. Drawing on Hall (1993), we explore the extent to which these represent a significant change at three levels: that of ideas (the goals of policy), mechanisms (the nature of the policy instruments), and settings (the fine-tuning of policy instruments). We examine how far the ideas driving the policy developments have been about the welfare of the family and its members, and the nature of the balance of continuity and change in policy instruments and settings, making some suggestions as to how this might be explained.